Results 41 to 50 of about 2,756 (214)

Phenolic Constituents of Flowers

Natural Product Communications, 2008
Species of Hypericum accumulate phenolic compounds with the phloroglucinol substitution pattern, and there are many reports of such substances isolated from the aerial parts of the plants.
Carolina Nör, Ana Paula Machado Bernardi, Juliana Schulte Haas, Jan Schripsema, Sandra Beatriz Rech, Gilsane Lino Von Poser   +5 more
doaj   +1 more source

Essential Oils of Yellow Leaves Obtained by Hydrodistillation and Supercritical Carbon Dioxide Extraction

Natural Product Communications, 2023
Background/Objective: Volatile compounds present in green Ginkgo biloba L. leaves extracts contain compounds that can undertake free radical scavenging.
Nina Djapic
doaj   +1 more source

Allenes from 3-bromo-2H-1-benzopyrans

, 1994
The anionic cleavage of 2H-1-benzopyrans results in the formation of ...
Rahman, M. Moshfiqur, Gabbutt, Christopher D., Hepworth, John D., Heron, B. Mark   +3 more
core   +1 more source

Synthesis and Evaluation of Thiochroman-4-One Derivatives as Potential Leishmanicidal Agents

Molecules, 2017
The S-containing heterocyclic compounds benzothiopyrans or thiochromones stand out as having promising biological activities due to their structural relationship with chromones (benzopyrans), which are widely known as privileged scaffolds in medicinal ...
Esteban Vargas, Fernando Echeverri, Iván D. Vélez, Sara M. Robledo, Wiston Quiñones   +4 more
doaj   +1 more source

Studies in claisen rearrangements a novel oxidative rearrangement of 3-aryloxymethyl-(4H)-benzopyrans

, 1983
3-Aryloxymethyl-(4H)-benzopyrans 2̲ have been found to undergo a novel Oxidative Claisen rearrangement. In contrast, the Claisen rearrangement of 3-aryloxymethyl-(2H)-benzopyrans afforded only the normal products 8̲
Balasubramanian, K. K., Selvaraj, S., Sanjeevi Babu, K. G., Rajagopalan, K.   +3 more
core   +1 more source

Highly enantioselective access to cannabinoid-type tricyles by organocatalytic Diels–Alder reactions

Beilstein Journal of Organic Chemistry, 2012
After prosperous domino reactions towards benzopyrans, the products were used as the starting material in Lewis acid catalyzed and organocatalytic Diels–Alder reactions to build up a tricyclic system.
Stefan Bräse, Nicole Volz, Franziska Gläser, Martin Nieger   +3 more
doaj   +1 more source

Synthesis of Benzopyran Atropisomers via Electrophilic Halogenation

European Journal of Organic Chemistry, EarlyView.
We report a halogenation‐based method for the synthesis of axially chiral benzopyrans, tolerating diverse substituents and halogens (Br, Cl, and I). A double bromination gives bisbenzopyrans with two stereogenic axes. Preliminary enantioselective conditions yield benzopyran atropisomer with up to 56% ee.
Alix Bourhis, Expédite Yen‐Pon, Jean Rodriguez, Damien Bonne   +3 more
wiley   +1 more source

Aluminum Triflate Catalyzed Tandem Reactions of d‑Galactal: Toward Chiral Benzopyrans, Chromenes, and Chromans

, 2016
3,4,6-Tri-O-acetyl-d-galactal is selectively converted into 1-O-aryl-2-deoxy derivatives or chiral bridged benzopyrans under Al­(OTf)3 catalysis, depending on reaction conditions.
Sandile B. Simelane (1754836), D. Bradley G. Williams (1517221), Alfred Muller (1754839), Henok H. Kinfe (1754833)   +3 more
core   +1 more source

Optimising the Eco‐Friendly Extraction of Carotenoids From Gac Fruit: A Sustainable Solution for Natural Red Food Colourants

Food Chemistry International, EarlyView.
Gac fruit's high carotenoid content, especially in the aril, makes it an excellent natural red pigment source for food applications, offering a safer alternative to synthetic dyes. Ethanol extraction achieved the highest overall pigment recovery (89.53%), whereas ethyl lactate extraction yielded the highest levels of total carotenoids, β‐carotene ...
N. Netravati, S. Gomez, B. Pathrose, A. Suma, J. Hosamani   +4 more
wiley   +1 more source

Identification of Two Novel Anti-Fibrotic Benzopyran Compounds Produced by Engineered Strains Derived from Streptomyces xiamenensis M1-94P that Originated from Deep-Sea Sediments

Marine Drugs, 2013
The benzopyran compound obtained by cultivating a mangrove-derived strain, Streptomyces xiamenensis strain 318, shows multiple biological effects, including anti-fibrotic and anti-hypertrophic scar properties.
Lei Feng, Xue-Gong Li, Jun Xu, Tie-Sheng Han, Shu-Jie Xie, Min-Juan Xu, Ya-Hui Wang, Zhi-Gang Zhang, Zhong-Yuan You   +8 more
doaj   +1 more source